Static Synchronous Compensator For Electric Arc Furnace - Chinaprice: contact company for price
Improve power factor
Wanlida Static Synchronous Compensator
Improve the stability of power transmission
In long distance transmission system, Static synchronous
compensator (STATCOM) can not only compensate the power line
losses caused byreactive power, increase line voltage and
improve effective transmission capacity under normal
operation, but also offer reactive power adjustment in time,
damp system oscillation and improve system stability incase
Maintain the receiving-end voltage level
Since high capacity load centers lack reactive power
support, it is easy to cause grid voltage dip, evencause
voltage collapse. However, Static synchronous compensator
(STATCOM) is capable of fast var adjustment. Therefore, the
receiving-endvoltage level is greatly stabilized.
Reactive power compensation leading to high power factor and
low line losses
Many types of loads need a mass of reactive power when
operation, such as asynchronous motors, arcfurnaces, rolling
mills and high rating rectifiers. At the same time, the
upstream transformer and lineimpedance also generate
reactive power, which still leading to low power factor.
For the power system, loads with lower power factor will
increase the line losses, voltage drop anddeterioratevoltage
quality. Additionally, reactive power will reduce efficiency
of power generation, transmission and distribution. For
clients, low power factor will increase production costs.
Restrain voltage fluctuation and flicker.
Voltage fluctuation and flicker are mainly caused by rapid
loads variation. This rapid variation also causesthe load
current fluctuation dramatically. The current variation
leads to system voltage losses changingvery fast, which
brings the receiving-end grid voltage flicker. The typical
loads that cause voltage flicker arearc furnaces, rolling
mills, electric locomotives, etc.
Static synchronous compensator (STATCOM/SVG) can offer fast
reactive power regulation, which mitigate voltage
fluctuation and flicker easily caused byloads variation.
Now, Static synchronous compensator (STATCOM/SVG) is the
best solution to restrain voltage fluctuation and flicker
compared with MCR, TCR etc.
Mitigate 3-phase unbalance.
In distribution network, there are a lot of 3-phase
unbalance loads, typically like electric locomotives and
arcfurnaces. At the same time, line and transformer
impedance unbalances can also cause voltage
unbalanceproblem. Static synchronous compensator (STATCOM)
can fast compensate negative sequence current caused by
unbalance loads, which ensurebalanced 3-phase grid current.
Thus, it improves the power supply quality greatly.
Eliminate harmonics including Even-order, Odd-order,
subharmonic and inter-harmonics(Option)
Static synchronous compensator (STATCOM/SVG) has very good
harmonic suppression functions including even-order
harmonic, odd-order harmonic, subharmonic and inter-
harmonics, it adopted Instantaneous power theory to detect
and calculate harmonic current automatically and then
control PWM converter, and input compensated current into
power grid which is of the right magnitude with harmonic
current, but with inverse polarity.
Structure of Wanlida Static Synchronous Compensator
It mainly consists of reactor, start-up cabinet, cascade
multilevel inverters cabinet and control cabinet.
Static Synchronous Compensator has the following advantages
compared with traditional compensation methods:
Faster response speed
STATCOM response time: ≤5ms
Traditional static compensator response time: ≥10ms.
STATCOM can finish the conversion from rated capacitance var
to rated inductance var in a very short time. This
unexampled response speed makes STATCOM very suitable for
impact load compensation.
Stronger voltage flicker restrain capability
SVC can restrain voltage flicker to 2:1 in maximum, but
STATCOM can achieve 5:1, even higher. SVC cannot improve its
capability for voltage flicker mitigation even with high
capacity because of low response speed. But STATCOM responds
fast. When its
capacity is increased, the capability of voltage flicker
mitigation can be further improved.
Wide operation range
STATCOM can work from rated inductive power to rated
capacitive power. So compared with SVC, STATCOM operation
range is much wider. Furthermore, STATCOM can output rated
reactive current even under low system voltage.
Multiple compensation function
STATCOM is not only functioned as fast reactive power
compensator, but also harmonics and unbalance compensator
to different demands of different clients.
Low harmonic content
STATCOM utilizes PWM, 3-level and multiple technologies.
Therefore, it generates very low harmonics with compensating
harmonics at the same time. Thus, STATCOM becomes a true
HV big capacitors and reactors are not necessary. STATCOM
installation area is greatly smaller than that of the same
capacity SVC, only 50% or even lower.
At the same time, Wanlida cooperates with the No.1 Science
university in China---Tsinghua University to develop SVG,
but the most important advantage for Wanlida is that we have
many years experiences for Medium voltage variable frequency
drives technology, because the Static Var Generator has
almost structure and technology with Medium voltage variable
frequency drives, in addition, Wanlida has over 21 years
experiences for protection relays for reactor, capacitor
Provides fast smooth dynamic compensation from inductive to
capacitive in reactive power, also eradicates reactive power
delivery to power grid, it can meet the maximum request to
compensate power factor and keep power factor close to 1.0
Low power loss, more better economical operation.
Has powerful capability to support voltage and ability to
continuously operate under the 1.1 times of overload.
More fast response time and better effect for restraining
Produce no harmonic and and compensate nearly all load
harmonics without amplifying them and without generating
harmonic resonance, it has more safety, stability and
reliability because it is not sensitive to the system power
Modular design. All power units are the same in structure
and electric performance, thus they are interchangeable,
which is easy for installation and maintenance. Redundant
N+1 structure provides more higher reliability.
Less space for installation.
Rated reactive output
Capable of continuous output that ranges from inductive
rated reactive to capacitive rated reactive
3phase3wires Star connection
≤2% of rated power
Capable of continuous operation at 1.1 times overload
When it only compensates reactive power output, THDU <3%,
THDI <4%; harmonic suppression rate when harmonic wave
Allowable unequalization degree of voltage
The permissible value of unbalance degree of connection-
point system voltage shall not exceed 60%
Touch screen, full-digitalized control
Power grid overvoltage, undervoltage, voltage imbalance;
overload, inverter over/undervoltage, overcurrent ,
overtemperature; capable of automatic exiting from the power
grid in case of a equipment failure
Ethernet; capable of background-computer remote monitoring;
reserved with RS485/232 interface
Forced air cooling
Factory Acceptance Test
We built the first-class high voltage and big capacity power
electronic equipments test platform to realize Factory
Acceptance Testing for whole machine before delivery.
- Posted By: Zhuhai Wanlida Electric Co., Ltd.
- Phone: 867563395623
- Address: Wanlida Relay Protection Industrial Park, No. 1 Te, Zhuhai, China
- Website: http://www.zhwld.com/en
Published date: August 23, 2013 -
- Business Description: Incorporated in 1991, Zhuhai Wanlida Electric Co., Ltd. (www.zhwld.com)
('the Company'), is located in Relay Protection Industrial Park, No.1
Technology Road, Science and Technology Innovation Coast, High tech
Zone, Zhuhai City, coving a land area of approximately 60 thousand
square meters (including Park 1 and Park2). The Company was listed for
equity financing on November 13, 2007 (equity securities abbreviated as:
Wanlida stock certificates, code: 002180), with a registered capital of
124,980,000 Yuan. The Company keeps on her aggressive 'production,
study, research and application' co operation with the famous academies
such as Tsinghua University, Chinese Academy of Sciences and Central
China University of Science and Technology and carries out relevant
technology innovation. It is a national high tech enterprise that deals
with specialized development, production and sales of substation
integrated automation systems and Medium voltage variable frequency
drives, Medium voltage magnetically controlled soft starters, Static
synchronous compensator(STATCOM/SVG), Static VAR compensator(SVC),
Active power filter(APF/AHF), Thyristor switched capacitor bank
(TSC/TSF), High voltage direct current light transmission systems etc
power electronic equipments. In addition, the Company is known as a
famous manufacturer and backbone enterprise of transformer substation
integrated automation and power electronic equipments fields in China,
and it also acts as fresh blood in the field of energy conservation and
Wanlida passed the ISO9001 quality system certification, ISO14001 Environment Management System Certification and OHSMS18001 Occupation Health &Safety Management System Certification; All products passed the test of sated authoritative inspection bureau. And it had been rated as 'National High and New Technology Enterprise', 'Enterprise Recommended by State Economic and Trade Commission for Reconstruction of Urban and Rural Electric Grids', 'Key Software Enterprise Covered by National Program', 'Excellent enterprise of China', 'First choice Manufacturer for Electric Framework Protocol Sponsored by CNPC', 'Excellent Enterprise of Guangdong Province', 'Optimum Good faith Enterprise of Guangdong Province', 'Contract honoring Enterprise of Guangdong Province', 'Top 10 Private Enterprises of Zhuhai City', and 'Enterprise with Grade AAA Bank Credit '.
Wanlida has a very strong R&D teamwork which has a population of over 100 with doctor's degree, postgraduate degree and bachelor's degree etc, and all of the products are designed strictly according to IEC standards; Wanlida has modern standard workshops, it brought advanced SMT production lines and wave soldering machines into company from abroad, and built the first class high voltage and big capacity power electronic equipments assembling and test platform, which is able to realize full load test and ensure that all of products have exquisite technics and reliable quality; At present, Wanlida covers all of domestic areas except Hongkong, Macau and Taiwan, and it also sells the products to Southeast Asia, Middle East, South America, Africa etc over 20 countries.
The Company aims to grow into the most dedicated electric automation enterprise in the world, and commits itself to building the aircraft carrier of power electronic energy efficiency products.
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